"set/p" doesn't work, I can't make out how "set" works-CodePudding

@echo off
REM turning off the output of commands to the screen
Set /P "%~1=Extension: "
if "%~1" == "" echo Extension not introduced
REM if you do not enter anything, the extension is not entered
if not exist "*.%~1" echo No files found
REM if you entered an extension that does not exist, it will give you no files found.
DEL /Q "*.%~1"
REM delete files with the specified extension without confirmation

I can't figure out how "set" works. Help to make it so that: after launching batch, you had to enter the extension and then it would be deleted or output that it was not found.

CodePudding user response：

(not really worth an answer, but comments are not good at displaying readable code)

%~1 is the first parameter to the script. When I understand you correctly, you don't want any parameters, but you want the script to ask for input.

You have to use a variable (%variable%) instead of a parameter then:

@echo off
:label
set /p "ext=" & REM clear variable because `set /p` leaves it unchanged when you enter nothing
Set /P "ext=please enter Extension: "
if "%ext%" == "" echo Extension not introduced & goto :label
if not exist "*.%ext%" echo No files found & goto :label
DEL /Q "*.%ext%"

(removed the comments and added some basic "code flow")

CodePudding user response：

Why not just try to simplify your flow by using If's, labels, and GoTo's?

Example

@Echo Off
SetLocal EnableExtensions DisableDelayedExpansion

For /F "Delims==" %%G In ('"(Set Ext) 2>NUL"') Do Set "%%G="
Set "Ext=%~1"
If Defined Ext GoTo ChkExt

:GetExt
ClS
Set /P "Ext=Enter extension [without leading period]>"
If ErrorLevel 1 GoTo GetExt

:ChkExt
Set Ext | %SystemRoot%\System32\find.exe "." 1>NUL
If Not ErrorLevel 1 GoTo GetExt

:DelExt
%SystemRoot%\System32\choice.exe /M "Delete all %Ext% files in